This adds the ability to display the remote hostname
of the visitors IP with template actions.

template: add test for custom function

Signed-off-by: Tw <tw19881113@gmail.com>

template: support custom functions

Signed-off-by: Tw <tw19881113@gmail.com>

proxy: use untouched URL for concatenating

Maps are NOT ordered at runtime but I still want the cipher suites
listed in order of preference in the source file for convenience.

Original feature request in forum:
https://forum.caddyserver.com/t/caddy-with-specific-hosts-but-on-demand-tls/1704?u=matt

Before, Caddy obtained certificates for every name it could at startup.
And it would only obtain certificates during the handshake for sites
defined with a hostname that didn't qualify at startup (like
"*.example.com" or ":443"). This made sense for most situations, and
helped ensure that certificates were obtained as early and reliably as
possible.

With this change, Caddy will NOT obtain certificates for hostnames it
knows at startup (even if they qualify) if OnDemand is enabled.

But I think this change generalizes well, because a user who specifies
max_certs is deliberately turning on On-Demand TLS, fully aware of
the consequences. It seems dubious to ignore that config when the user
deliberately put it there. We'll see how this goes.

Signed-off-by: Tw <tw19881113@gmail.com>

* caddyhttp: Allow to alternate Index

* Move Index directive

* Fix misspelling outside this PR

log: only allow new roller related options in a block

proxy: Fix #1574; health check now respects hostname when upstream Host header is configured (#1577)

* Implement adding Host header to health check

* Fix type problems

* Fix duplicate function, Replace args

* Add debugging

* Add debugging

* Add debugging

* Add debugging

* Attempt to set req.Host instead of the header

* Clean up debugging

* Fix missing newline

* Fix spelling

* Add test, refactoring

* Fix with gofmt

* Add error check on NewRequest

fix issue #1529
Signed-off-by: Tw <tw19881113@gmail.com>

* Create list of index files based on extensions and check on a per config
basis

* remove log lines

* fixed tests

* made gofmt suggested change

* Changes made to simplify

browse: fix arbitrary ordering of directories with sort=size

* Respect the 'insecure_skip_verify' for the health check.

* WIP: Trying to add a test. Non functional.

* Fixing tests.

* Creating better error messages.

* Optimize two more error messages.

* Move the tests into an extra function.

* Add a shutdown function and context to staticUpstream so that running goroutines can be cancelled. Add a GetShutdownFunc to Upstream interface to expose the shutdown function to the caddy Controller for performing it on restarts.

* Make fakeUpstream implement new Upstream methods.

Implement new Upstream method for fakeWSUpstream as well.

* Rename GetShutdownFunc to Stop(). Add a waitgroup to the staticUpstream for controlling individual object's goroutines. Add the Stop function to OnRestart and OnShutdown. Add tests for checking to see if healthchecks continue hitting a backend server after stop has been called.

* Go back to using a stop channel since the context adds no additional benefit.
Only register stop function for onShutdown since it's called as part of restart.

* Remove assignment to atomic value

* Incrementing WaitGroup outside of goroutine to avoid race condition. Loading atomic values in test.

* Linting: change counter to just use the default zero value instead of setting it

* Clarify Stop method comments, add comments to stop channel and waitgroup and remove out of date comment about handling stopping the proxy. Stop the ticker when the stop signal is sent

* Revert "browse: sort listing by dir first (#1527)"

 commit 4e1229e7.

* Add new browse sort order  namedirfirst. Make namedirfirst default sort

init: Make CADDYPATH equal across init scripts

Previously directories have been merely pulled to the front, and then
sorted arbitrarily. That is, their order among themselves depended on
the filesystem implementations. Something opaque to the visitor.

This fixes said inconsistency, and implements the by-size-then-by-name
order I initially intended for this.

See also https://github.com/mholt/caddy/pull/1272#issue-191256343

* Add Event Hook plugins to DescribePlugins function

* Update plugins.go

* Update plugins.go

* add Hook

* update hooks

* remove parenthesis

* Update requests

* Default Browse sort by Dir, File

* Ignore temp template files

* Add folder to test

* unneeded chagne

HTTP redirects can use host-relative URLs. See discussion in #1497.

* Use helper functions in staticfiles to redirect.

Previously the browse package invoked staticfiles.Redirect when
redirecting clients who requested a directory but with a Request-URI
that did not contain a trailing '/'. staticfiles.Redirect only used a
relative URI. This change defers the decision of how to format the
Location header value to the helper methods in the staticfiles package.

* Update const URLPathCtxKey in browse package.

* Add the first policy which sends the request to the first available host

* Make the error message clear. As we expect the second not first upstream
host.

* Added Const for CtxKeys

* Move CtxKey Const declarations

* Fixed tests

* fix test

* staticfiles: add Content-Length header (closes #1479)

* make linter happy, rename "Html" in identifiers to "HTML"